Late Triassic – Mid-Jurassic to Neogene Extensional Fault Systems in the Exmouth Sub-Basin, Northern Carnarvon Basin, North West Shelf, Western Australia

Sukonmeth Jitmahantakul, Kenneth McClay

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This paper documents a detailed tectono-stratigraphic
analysis of five merged 3D seismic surveys that cover the greater
part of the Exmouth Sub-basin in the Northern Carnarvon
Basin on the North West Shelf of Australia. The Exmouth
Sub-basin is a major, NE- to NNE-trending Mesozoic to
Cenozoic depocentre within the intra-passive margin Northern
Carnarvon Basin on the North West Shelf of Australia. Late
Triassic (Rhaetian) to Middle Jurassic (Callovian) westdirected
extension produced N-S to NE-SW striking planar
domino-style extensional fault systems that formed a NNE to
NE trending rift basin, offset and segmented into 4 discrete
depocentres by E-W striking accommodation zones. Three
discrete and tectonically distinct systems of extensional faults
have been identified within the Exmouth Sub-basin:
1. Rhaetian–Callovian planar fault systems of the major rift
2. Late Berriasian–Early Valanginian post-rift, strata-bound,
planar domino fault arrays; and;
3. Late Cretaceous–Neogene polygonal fault arrays formed
during passive margin subsidence and sedimentation.
The tectono-stratigraphic evolution of the Exmouth Subbasin
is discussed and a revised model for the basin evolution
and for the development of the fault systems is presented.
Original languageEnglish
Title of host publicationProceedings Western Australian Basins Conference
Number of pages23
Publication statusPublished - 31 Aug 2013

Cite this